int
nbdgramsend(NbDgramSendParameters *p, uint8_t *data, int32_t datalen)
{
NbDgram s;
uint8_t dstip[IPaddrlen];
s.type = p->type;
switch (p->type) {
case NbDgramBroadcast:
case NbDgramDirectGroup:
ipmove(dstip, nbglobals.bcastaddr);
break;
case NbDgramDirectUnique:
if (!nbnameresolve(p->to, dstip)) {
werrstr("nbdgramsend: name resolution failed");
return 0;
}
break;
default:
werrstr("nbdgramsend: illegal datagram type");
return 0;
}
s.flags = NbDgramFirst;
s.id = nextdgramid();
ipmove(s.srcip, nbglobals.myipaddr);
s.srcport = NbDgramPort;
s.datagram.offset = 0;
s.datagram.data = data;
s.datagram.length = datalen;
nbnamecpy(s.datagram.dstname, p->to);
nbnamecpy(s.datagram.srcname, nbglobals.myname);
return nbdgramsendto(dstip, NbDgramPort, &s);
}
NbSession *
nbssconnect(NbName to, NbName from)
{
Session *s;
uchar ipaddr[IPaddrlen];
char dialaddress[100];
char dir[NETPATHLEN];
uchar msg[576];
int fd;
long o;
uchar flags;
long length;
if (!nbnameresolve(to, ipaddr))
return nil;
fmtinstall('I', eipfmt);
snprint(dialaddress, sizeof(dialaddress), "tcp!%I!netbios", ipaddr);
fd = dial(dialaddress, nil, dir, nil);
if (fd < 0)
return nil;
msg[0] = 0x81;
msg[1] = 0;
o = 4;
o += nbnameencode(msg + o, msg + sizeof(msg) - o, to);
o += nbnameencode(msg + o, msg + sizeof(msg) - o, from);
hnputs(msg + 2, o - 4);
if (write(fd, msg, o) != o) {
close(fd);
return nil;
}
if (readn(fd, msg, 4) != 4) {
close(fd);
return nil;
}
flags = msg[1];
length = nhgets(msg + 2) | ((flags & 1) << 16);
switch (msg[0]) {
default:
close(fd);
werrstr("unexpected session message code 0x%.2ux", msg[0]);
return nil;
case 0x82:
if (length != 0) {
close(fd);
werrstr("length not 0 in positive session response");
return nil;
}
break;
case 0x83:
if (length != 1) {
close(fd);
werrstr("length not 1 in negative session response");
return nil;
}
if (readn(fd, msg + 4, 1) != 1) {
close(fd);
return nil;
}
close(fd);
werrstr("negative session response 0x%.2ux", msg[4]);
return nil;
}
s = nbemalloc(sizeof(Session));
s->fd = fd;
s->state = Connected;
qlock(&sessions);
s->next = sessions.head;
sessions.head = s;
qunlock(&sessions);
return s;
}
